toward the end there is something going on
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During one of the battles Petra takes her force out too far and looses sight of the others. She makes a mistake, looses most of her fighters and falls apart. As they carry her out of the battle room Ender can hear Petra screaming,
"Tell him Im sorry, I was just so tired, I couldn't think, that was all, tell Ender I'm sorry." We later learn, when Mazer speaks to Ender, that Petra will recover.